Thread: Build Log Depron Ziroli Viggen
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Old Dec 30, 2011, 09:54 PM
flyingfitz737 is offline
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United States, IL, Edwardsville
Joined Dec 2011
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Build Log
Depron Ziroli Viggen

Hello All,

I am building a lightweight Saab Viggen from a set of Nick Ziroli plans I have had since the mid 1980's. Target weight is 1 pounds with retracts and a lightweight glass finish. Hopefully the light wing loading (7-10 oz/sq ft), will allow flight characteristics suitable for flight in a large indoor venue. I would like to have the Viggen finished for this year's E-Fest.

The model will be made mostly of Depron and sized 1:1 off the original plans. The only wood will be the balsa sticks in the wing, the mounting plates for the GWS retracts, and the ply motor mount. Sides, formers, ribs, canard and vertical tail will be 6mm. Wing sheet and ducting will be 2mm. The forward fuse section will be made of 3mm. The nose block will be carved from white foam. The whole plane will be finished with oz glass cloth and either Minwax Poly or Zpoxy. The glass finish is actually the reason the Viggen project got started. I needed a relatively simple project to experiment with glassing Depron. This will help pave the way for a much bigger project down the road.

Power will be from a 1350 MAh, 3 cell LiPo battery, 35 amp speed control and a 3400 KV Medusa Motor driving a ducted 4 in APC prop. GWS retracts will have two wheels on each main gear truck like the real Viggen. Control surfaces will include elevons, rudder, and flaps on the foreplane. Too many GWS Naro servos will provide control movement.

So far this has proven to be a great project. The airframe would have already been completed, but after seeing how cool it was going to be it just couldn't live without the retracts! Flap mixing on the canards was another thing it had to have. All this has added more complexity more servos and more weight. I haven't built in a long time and never with Depron. I am sure this will be a great learning experience.

Will update with progress and pics. Hopefully this will keep me motivated and give all on this forum something to smile about!

Fitz
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